Device for the removal of teeth

ABSTRACT

A divice for the removal of teeth and/or tooth roots from a tooth socket or from a jawbone includes an extractor having a fisrt and second lever and a first and second branch pivotably connected to each other by a hinge, the first branch including a receiving part. A rod for mechanically and manually adjusting the first and second levers is provided. An adjusting part for axially moving the rod relative to the second lever against a force needed to extract a tooth is provided. An extracting part including at least one resistance element is provided for anchorinf the tooth or a tooth stump, the extracting part including a first support for coupling with the receiving part of the first branch. A second support is placed against the extractor and has an openning for the extracting part.

The invention relates to a device for the removal of teeth and/or toothroots from the tooth socket or from the jawbone by means of anextractor.

BACKGROUND

Devices for the removal of teeth from the tooth socket or jaw such asextracting pliers are already known (DE 198 15 133 A1, DE 686 412 and DE37 40 474), each of which is equipped with an extractor, consisting ofat least one first support that can rest in the oral cavity or on thejawbone ridge or on the top or crown of the tooth and that has at leastone opening, of a second support that can rest on the first support andthat has a screw part, and of at least one extracting part that extendsthrough the openings of the first and/or at least one second support andthat has one or more resistance elements.

The device according to DE 198 15 133 A1 especially has the drawbackthat, due to the high forces involved, the root screw cannot be movedsmoothly out of the tooth bed without causing damage since, when the twolever arms are actuated, the force exerted cannot be appropriatelyregulated and consequently, the alveolar wall might be damaged duringthe extraction of the tooth.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a device for theremoval of teeth from the tooth socket or from the jawbone and for itsplacement into the oral cavity of a patient to be done in such a waythat the teeth can be removed without damaging or disproportionatelyenlarging the tooth socket, so that damage or severe harm to thealveolar wall can be largely avoided.

A device according to the present invention may include the followingfeatures:

-   1.1 the device has an extractor or a plier-like extractor on which    an impression tray configured as a support is arranged or to which    the impression tray can be connected;-   1.2 the support serves to receive a deformable compound or an    impression material,-   1.3 the impression tray or the support and/or the impression    material can rest directly in the oral cavity or on the jawbone    ridge or on the top or crown of the tooth,-   2.1 the support or the impression tray has at least one opening,-   2.2 at least one extracting part or screw part extends through the    opening,-   2.3 the extracting part is fitted with one or more resistance    elements that can be anchored in a tooth or tooth stump,-   2.4 the extracting part is also provided with at least one    additional support or adjusting part,-   3.1 the support or adjusting part can be inserted into a receiving    part or into a slit opening,-   3.2 the receiving part or the two slit openings are provided in a    lever means of the plier-like extractor,-   3.3 the two lever means are joined together by a hinge so that they    can pivot and each has another lever arm,-   3.4 the two lever arms can be configured by means of an adjusting    device so as to pivot against the action of a spring element.

Through the advantageous configuration and arrangement of the extractor,the diseased tooth can be readily pulled out of its root bed in theaxial direction or in the lengthwise direction of the tooth withoutenlarging the root bed, so that the latter is suitable for receivingimplants without necessitating major follow-up treatment.

For this purpose, it is advantageous for the lever means to be part of apair of pliers having two levers joined by the hinge and to be followedby two branches which can lie against each other in one position andwhich move apart when the levers are actuated, thus adjusting theextractor. It is also advantageous for the lever means to be part of apair of pliers having two levers joined by a hinge, whereby a rod with athread is connected to the one lever, and it extends through an openingor bore of the second lever, whereby the spring element that pushes thetwo levers apart is situated between the two levers.

It is likewise advantageous for the pin to have a first resistanceelement or threaded part that can be inserted into an opening of thetooth and for it to have an adjusting part and/or a second threadedpart.

It is also advantageous for the thread of the first and second threadedparts to be configured so as to wind in opposite directions.

Moreover, it is advantageous for the support to be configured in such away that it can rest on at least two or more teeth located next to thetooth that is to be extracted.

Finally, in a preferred embodiment of the solution according to theinvention, it is provided for the support to be designed as a toothimpression tray and to have one or more openings or an oblong holeopening.

It is also advantageous for the tooth impression tray to be made up of awall part configured as a support and of at least two side parts thatdelimit the wall part and that match the curvature of the jaw.

In conjunction with the configuration and arrangement according to theinvention, it is advantageous for the upper end of the pin to have acoupling part for connecting an adjusting arm.

Furthermore, it is advantageous for the extractor to consist of at leastone support that can rest in the oral cavity or on the jawbone ridge oron the tops or crowns of the teeth and of an extracting part or pin thatcan rest on the support and that has one or more resistance elementsthat are hook-shaped and/or that prevent friction and/or that canwithstand pulling stress, whereby at least one resistance element or athreaded part can be inserted into the interior of the tooth and firmlyanchored there.

Moreover, it is advantageous for an adjusting part to be inserted or toact between the extracting part or the pin and the support and, by meansof this adjusting part, the pin can be pulled out of the tooth socket,together with the tooth.

It is likewise advantageous for the upper end of the rod to have acoupling part or threaded part for connecting an adjusting part and/or anut.

Furthermore, it is advantageous for the rod to receive at least onespring element.

In another embodiment of the invention, it is advantageous for the firstsupport or the impression tray to be permanently or detachably arrangedon one lever or on one branch and for the extracting part or else therod to have an adjusting part and/or a locking part by means of whichthe rod can be actuated.

Finally, it is advantageous for the adjusting part to be configured as astepping motor that can be made to interact with or drive the rod or thepin and by means of which the tooth can be pulled directly or indirectlyout of the tooth socket.

It is also advantageous for the pin to be configured rigidly and to haveat least one marking or notch between its upper and lower ends or elsetwo markings arranged at a distance from each other in such a way thatthey serve as a reference for the path of movement of the tooth out ofits socket.

Since the pin is provided with two opposing threads, it can be easilyscrewed into the tooth or into the tooth canal or root canal andanchored in such a way that the pin can withstand pulling stress. Byusing a second thread, a locknut can easily be screwed and it can thenrest on a support when the pin is turned by means of a crank. Thesupport can advantageously rest on suitable supporting means on thedental enamel or on the jawbone ridge. For this purpose, it isadvantageous to provide impression material between the support and thedental enamel. The support then rests on the adjacent teeth via theimpression material without excessively stressing them or destroying thedental enamel. If there are no teeth present in the immediate vicinityof the tooth that is going to be pulled, then the impression materialcan also be shaped in such a way that it can easily rest on the jawboneridge. In an advantageous manner, the support is configured in such away that it can also rest on several adjacent teeth. The support canalso be configured as an impression tray that matches the curvature ofthe dentition and that is readily suited to receive the impressionmaterial.

In an advantageous manner, the impression tray can be provided withseveral consecutively arranged bores or with an oblong hole opening intowhich the pin can be inserted.

For example, in order to attach a lever arm to the upper end of the pin,the latter can have a coupling part or a hexagonal connection onto whicha coupling element of a ratchet wrench can be placed. The pitch of theupper thread is selected in such a way that, with the smallest possibleapplication of force, the tooth can be pulled out of the tooth socket.The threaded part can also be advantageously configured as a metric finescrew thread.

Since a nut or a second support with a threaded part can rest on thesupport, the pin and an already mentioned ratchet wrench can be used topull out the pin affixed in the tooth—via the first support and via thenut that can rest on the support—upwards in the axial direction of thetooth out of the socket without destroying the latter.

The distance between the upper edge of the tooth and the bottom of thefirst support is selected here in such a way that there is a sufficientspace to pull the tooth out of the tooth socket.

In another embodiment of the invention, it is advantageous for theextractor to consist of at least a first support that has at least oneopening and that can rest in the oral cavity or on the jawbone ridge oron the top or crown of the tooth, of a second support that has a screwpart and that can rest on the first support, and of at least oneextracting part that extends through the openings of the first supportand/or at least one second support and that has one or more resistanceelements, whereby the first and/or the second support is part of a levermeans having at least one opening through which the extracting partextends in such a way that, when the lever means is actuated, at leastone resistance element and/or one threaded part, which can be insertedor firmly anchored in the interior of the tooth, moves approximately inthe lengthwise direction of the tooth or tooth stump, thereby pullingsaid tooth or tooth stump out of its socket.

Furthermore, it is advantageous for the marking to be situated on athreadless shaft part of the pin.

As a result of the advantageous arrangement, teeth or also root remnantscan be removed without having to exert a great deal of force. Theflawless removal of single-root teeth also allows immediate implantationsince the alveoli remain largely undamaged. Fractured, single-root teethcan likewise be removed. Moreover, due to the gentle treatment of thealveoli, extraction therapy is possible in orthodontics for children(premolar area). In particular, the simple lever arrangement inconjunction with the adjusting device allows a very careful and—ifnecessary—measured extraction of the tooth from its root bed, wherebythe non-traumatic extraction technique can be performed while retainingall of the soft and hard tissue structures.

This treatment leads to fewer postoperative symptoms, i.e. less pain,reduced swelling, in addition to which the healing is also improved.Thanks to the adjusting device, especially the screws with wing nuts atthe end of the lever arm, a very fine regulation of the lever forces canbe achieved. Since the upper and the lower lever parts are each providedwith a slit-shaped opening, the front end can be placed precisely andquickly onto the root screw. For this purpose, it is advantageous forthe front part of the lever to be tapered so that there is also acorresponding placement position on the support or on the impressiontray for this purpose.

BRIEF DESCRIPTION OF THE DRAWINGS

Additional advantages and details of the invention are explained basedon exemplary embodiments with reference to the drawings. The followingare shown:

FIG. 1 a schematic representation of a molar, partially in a sectionalview with the pin screwed into the molar, and the appertaining support,

FIG. 2 a ratchet wrench for adjusting the pin screwed into the tooththat extends through an opening in the support or impression tray forreceiving the impression material,

FIG. 3 a schematic representation of the extractor that can rest via theimpression material on several incisors and a molar,

FIGS. 4 a, 4 b respective embodiments of a tooth impression tray forreceiving the impression material,

FIGS. 5 a, 5 b respective sections along lines 4/4 and 4′/4′ shown inFIGS. 4 a and 4 b, respectively

FIG. 6 a perspective representation of the closed pliers with twobranches configured as levers, whereby an impression tray is touchingone branch, with the screwed-in root screw or extracting part,

FIG. 7 a representation similar to that of FIG. 6, whereby the pliersare open,

FIG. 8 a perspective view of the extracting part or of the root screwbefore the latter is screwed into the tooth, with a holder and a squarewrench.

DETAILED DESCRIPTION

In the drawing, FIG. 1 shows a schematic representation of a molar 5 inwhich the dental enamel 32, the dentin 26, the cementum 28, the rootcanal 29, the periodontium 30, the jawbone 31 and the dental pulp 33 areschematically indicated. In the drawing, as shown in FIG. 1, anextracting part or a pin 11 is screwed into the molar 5. The pin 11consists of an upper, right-handed thread 16 that can be configured as ametric fine screw thread. The threaded part 16 is followed by anotherthreaded part 17, whose winding is opposite that of the threaded part 16and which can also be configured as a self-cutting thread and it can bescrewed into a bore that has been prepared in the tooth 5 so securelythat it can readily withstand the tensile forces that need to be appliedin order to pull the tooth 5, without causing the tooth or the dentalenamel 32 to break in the process.

In FIG. 3, for example, the pin 11 is screwed into an incisor, namely,into the root canal 29. The screwed-in depth of the pin 11 depends onhow firmly the tooth to be pulled is attached and this depth is selectedin such a way that it does not extend into the jawbone 31.

FIG. 1 shows a support 9 that, as shown in FIG. 5, can also beconfigured as an impression tray for receiving impression material and,for this purpose, can match, for example, the outer contour of the jawso that the impression tray with the impression material 36 can beplaced onto the top of the tooth or the tooth crown 7 in a dimensionallystable way and no impairment or damage to the healthy teeth occurs. Ifthere are no support teeth in the vicinity of the tooth to be pulled,then the possibility also exists to rest the support 9 in anothersuitable place. In particular, it is advantageous here if the impressionmaterial rests on the jawbone ridge of the upper or lower jaw. As shownin FIG. 3, in an advantageous manner, as much impression material isused as is needed to ensure that there is a sufficient distance H₁between the bottom of the support 9 and the tooth crown 7 in order toprovide adequate space in the axial direction of the tooth 5 so thatsaid tooth can be pulled out of its socket very precisely without thetooth socket becoming enlarged in the process. Consequently, afterfollow-up treatment, the tooth socket is readily suitable to receivetooth implants.

The support shown in FIG. 3 can also be configured as a horizontallyoriented plate that is provided with a corresponding bore 10 or withnumerous consecutively arranged bores or with an oblong opening 10through which the pin 11 has to pass when it is to receive the support9.

As shown in FIG. 2, the support is placed via a bore 10 onto the pin 11,thus coming to rest, as shown in FIG. 3, on the adjacent healthy teeth 5or on the molars. Using the ratchet wrench 25, the pin 11 is screwedinto the tooth 5 that is to be pulled out. For this purpose, there is asecond support 34 on the top of the support 9, said support 34 beingprovided with a threaded bore 35. When the ratchet wrench 25 is turned,the pin 11 twists out of the support or else the nut 34 twists outupwards, thereby pulling the tooth out of the tooth socket in the axialdirection. In this process, the periodontium 30 between the toothsurface or the tooth neck and the tooth socket or jawbone 31 isgradually released. Thus, the tooth does not have to first be loosenedas used to be the case, but rather it can gradually be moved in theaxial direction by turning the ratchet wrench 25. Thanks to thisextraction method, the tooth socket does not become enlarged.

For this purpose, the ratchet wrench 25 is fitted with a coupling part24 that can be detachably positioned onto a corresponding coupling partprovided on the upper end of the pin 11.

Instead of the ratchet wrench 25, the pin 11 can also be actuated bymeans of a pneumatically or electrically powered motor that is not shownin the drawing. For this purpose, the motor is equipped with a left-handor right-hand drive so that first of all, it is suited for inserting thepin 11 into the tooth 5 and secondly it offers the possibility that,after the pin 11 has been inserted into the tooth 5, the pin 11 isturned in the opposite direction to the second threaded part 17 and saidpin 11 moves the tooth 5 upwards via the support 9. The nut shown inFIG. 3 is integrated into the drive motor for this purpose.

FIGS. 6 and 7 show another embodiment of a device for the removal ofteeth 5 and/or tooth roots from the tooth socket 3 or from the jawbone 4by means of an extractor that is configured as a lever means or as apair of pliers.

The pliers consist of a first handle 42 and of a second handle 46 thatare connected to each other by means of a bolt. Behind the hinge bolt41, there are two branches 39 that are securely connected to the handles42 and 46.

Relative to FIG. 6, at the left-hand end of the lever 42, there is a rod44 that is firmly attached to the lever 42 or else is screwed or weldedto it. The rod 44 is arranged perpendicularly on the lever 42 andextends through a bore 45 provided in the lever or handle part 46. Onthe outer end of the rod 44, there is a thread 43 to receive a screw ornut, for example, a knurled screw or wing nut 60, that can be adjustedby the operator so that the two handle parts 42 and 46 can be movedtowards each other and can assume a position as shown in FIG. 6. Forthis purpose, the wing nut 60 is turned clockwise. If the wing nut 60 isturned counterclockwise, the spring 47 provided on the rod and arrangedbetween the two handle parts 42 and 46 presses the two handle parts 42and 46 outwards as shown in FIG. 6 so that the two branches 39 can comeinto contact with each other.

Relative to FIG. 5, the first support 9 or an impression tray 9 issituated on the lower branch 39, and said support 9 rests directly orindirectly on the gum 27 via the dental compound or impression material36. The impression tray shown in FIG. 5 can be configured similarly tothe impression tray shown in FIGS. 2 to 4 b.

The impression tray 9 can be detachably or permanently connected to thebottom of the branch 39. For example, it is possible for the impressiontray to be screwed or welded to the branch 39.

The impression tray 9 is provided with one or more openings throughwhich the pin or the extraction screw or root screw 11 extend.

Like in the other embodiment, as shown in FIGS. 1 and 3, the extractionscrew 11 likewise has resistance elements or barbs or screw elements sothat the extraction screw as shown in FIG. 5 can be screwed into thetooth or tooth stump. Here, the extraction screw or pin 11 extendsthrough bores or openings 10 provided in the branches 39, whereby theupper end of the pin 11 projects from the surface of the branch 39.

In the embodiment as shown in FIG. 8, the root screw or the extractingpart 11 is shown in a perspective view and is screwed into an alreadyprovided bore 14 (not shown here) of the tooth 5 by means of the ratchetwrench 25 which, for this purpose, is placed onto an adjusting part orsquare part 55. The root screw 11 is held in the position shown in FIG.8 by means of a holder 59 so that the screwing procedure can be carriedout more easily. For this purpose, the root screw 11 has a threaded part13 with a screw-in depth T as shown in FIG. 8. The threaded part 13 isfollowed by a shaft part 58 with a marking 57 in the upper area. Thesquare part 55 is situated at the upper end of the shaft 58.

The bore 14 in the tooth 5 is selected slightly longer than the screw-indepth T of the root screw 11 so that, during the screwing procedure ofthe root screw into the bore 14, it is avoided that the lower end of thethreaded part 13 strikes the pocket hole part of the bore 14, whichcould cause the tooth to rupture. For this purpose, in an advantageousmanner, a marking ring 56 is provided at the upper end of the threadedpart or in the shaft area.

The upper end of the pin 11 can be provided with a thread so that thelocking element or a locknut is screwed onto the threaded part of thepin 11, as a result of which, first of all, said locking element securesthe pin 11 in the branch 39 and secondly prevents the branch 39 frompivoting beyond its length. At the upper end, the pin 11 can beadditionally provided with a hexagon for receiving an adjusting arm 25or a ratchet wrench. The pin 11 can be screwed into the tooth 5 by meansof the ratchet wrench 25.

As can be seen in FIG. 7, the front end of the upper lever or of thebranch 39.1 is provided with an oblong hole opening 10.1. The front areaof the lower branch 39.2 can also be provided with an oblong holeopening 10.2 so that the two branches 39.1 and 39.2 can be slid onto thecylindrical shaft part 58 crosswise to the longitudinal center axis ofthe root screw 11 (FIGS. 6 and 7).

According to another embodiment, the upper end of the root screw 11 canbe provided with a bore so that the front end of the branch 39.1 can beinserted with a mandrel-like connection part into the corresponding boreof the root screw 11. However, in order to do so, it is necessary forthe bore in the root screw 11 to be precisely aligned with themandrel-like connection element 39.

The handling of the device 1 for the removal of teeth, however, issubstantially improved in that both front ends of the branches 39.1 and39.2 are slit-shaped.

According to the embodiments of FIGS. 6 and 7, a wing nut 60 is screwedonto the upper end of the extracting part or of the root screw 11, andthe bottom end of said wing nut comes into contact with the surface ofthe lever 42 of the device 1 and, by appropriate further adjustment, itmoves the lever 46 in the direction of the lever 42, a process in which,as shown in FIG. 7, both branches 39.1 and 39.2 are moved apart and thepin 11 is pulled upwards. The upper branch 39.1 is adjusted until themarking 57 is visible between the two branches 39.1 and 39.2. Then theoperator knows that the tooth 5 can be pulled up sufficiently and canthus be removed from its tooth bed.

To summarize, the sequence of steps for using of the device 1 isexplained once again below.

For the extraction process of the tooth 5. as shown in FIG. 7, thepliers 38 are placed in the closed state onto the pin 11. The lock ornut 55 provided on the pin 11 readily allows an adjustment of the upperbranch 39 as shown in FIG. 6. In other words, when the pliers areactuated, i.e. when the handle 46 moves towards the handle 42, the twobranches 39 open and the pin 11 moves in the axial direction along acenter line of the rod, that is to say, in the axial direction of thetooth 5. In this manner, the tooth is pulled out of the tooth bedwithout damaging the gums. The exact movement of the rod 11 is along thea curved trajectory. The direction of movement is shown by the arrow inFIG. 7. Thanks to the slit provided in the branch 39, the rod 11 canalso run exactly on its center line so that no lateral pressure isexerted on the tooth 5.

LIST OF REFERENCE NUMERALS

-   1 device for removal of teeth=pliers-   2 extractor-   3 tooth socket, alveoli-   4 jawbone-   5 tooth, tooth stump, root remnant-   6 top of tooth-   7 crown of tooth-   8 jawbone ridge-   9 first support, impression tray-   10.1 opening, bore (FIG. 2) or slit opening (FIG. 5)-   11 extracting part, root screw, pin, extraction screw, root screw-   12 threaded part, right-hand thread, resistance element-   13 threaded part, left-hand thread, resistance element-   14 opening in the tooth-   16 thread-   17 thread-   24 coupling element-   25 adjusting arm, ratchet wrench-   26 alveolar bone-   27 gum-   28 cementum-   29 root canal-   30 periodontium, periodontal membrane-   31 jawbone-   32 dental enamel-   33 dental pulp-   34 second support, nut, screw part-   35 threaded opening, threaded bore-   36 impression material-   37 hand-   38 lever means, pliers-   39 connection element, branch-   39.1 upper branch-   39.2 lower branch-   40 pliers-   41 hinge axis, hinge bolt, hinge-   42 lever, handle-   43 thread-   44 rod-   45 bore-   46 second lever, handle-   47 spring element, spring-   55 adjusting part, square part, support-   56 marking-   57 marking-   58 shaft part-   59 holder-   60 adjusting part, wing nut, nut, knurled screw

1. A device for the removal of teeth and/or tooth roots from a toothsocket or from a jawbone, the device comprising: a plier-like extractorincluding first and second opposing handles and a first and a secondbranch pivotably connected to each other by a hinge in such a mannerthat the first and second branches pivot apart from each other as thefirst and second opposing handles pivot closer to each other, the firstbranch including a receiving part; a rod including a thread, the rodbeing affixed on one side to the first handle and extending through abore of the second opposing handle; a spring element disposed betweenthe first and second opposing handles so as to push the first and secondopposing handles apart, the second handle being axially moveablerelative to the rod; an adjusting pan configured to axially move the rodrelative to the second handle against an action of the spring elementand against a force needed to extract a tooth; an extracting partincluding at least one resistance element configured to anchor the toothor a tooth stump, the extracting part including at least a first supportconfigured to couple with the receiving part of the first branch; and asecond support disposable against the extractor and including at leastone opening configured to receive the extracting part, the secondsupport including an impression tray configured to receive a deformablecompound, at least one of the impression tray and the deformablecompound being disposable directly on at least one of an oral cavity, ajawbone ridge, a top of the tooth and a crown of the tooth.
 2. Thedevice as recited in claim 1 wherein the extracting part includes ascrew part.
 3. The device as recited in claim 1 wherein the receivingpart includes a slit opening.
 4. The device as recited in claim 1wherein the first support includes a second adjusting part.
 5. Thedevice as recited in claim 1 wherein the deformable compound includes animpression material.
 6. The device as recited in claim 1 wherein theadjusting part includes a wing nut.
 7. The device as recited in claim 1wherein the first and second handles and the first and second branchesform a pair of pliers joined by the hinge, the first and second branchesbeing disposable in a first position in which the branches are disposedadjacent one another and being movable apart from each other upon anactuation of the first and second handles so as to adjust the extractor.8. The device as recited in claim 1 wherein: the first and secondhandles and the first and second branches form a pair of pliers joinedby the hinge; and the rod extends through an opening of the secondhandle.
 9. The device as recited in claim 1 wherein the at least oneresistance element includes a first threaded part of a pin, the firstthreaded part being insertable into an opening of the tooth.
 10. Thedevice as recited in claim 9 wherein the at least one resistance elementincludes a second threaded part of the pin.
 11. The device as recited inclaim 9 wherein the pin includes a second adjusting part.
 12. The deviceas recited in claim 1 wherein the at least one resistance elementincludes a first and a second threaded part of a pin, threads of thefirst and a second threaded parts being configured to wind in oppositedirections.
 13. The device as recited in claim 1 wherein the secondsupport is configured to rest on at least two or more second teethdisposed next to the tooth.
 14. The device as recited in claim 1 whereinthe second support includes an opening.
 15. The device as recited inclaim 1 wherein the tooth impression tray includes a wall partconfigured as a support member and at least two side parts delimitingthe wall part and matching a curvature of the jaw.
 16. The device asrecited in claim 1 wherein the first support includes a second adjustingpart configured to connect to an adjusting arm.
 17. The device asrecited in claim 1 wherein an upper end of the rod includes at least oneof a coupling part and a threaded part configured to connect to theadjusting part.
 18. The device as recited in claim 1 wherein the rod therod is configured to receive the spring element.
 19. The device asrecited in claim 1 wherein the second support is at least one ofpermanently and detachably on at least one of the first and a secondhandle and the first and a second branch.
 20. The device as recited inclaim 1 wherein the extracting part includes a second adjusting partconfigured to actuate the rod.
 21. The device as recited in claim 1wherein the first support includes a rigid pin including at least one ofa first marking disposed between an upper and a lower end of the pin andtwo second markings disposed at a distance from each other so as toprovide a reference for a path of movement of the tooth out of a socketthereof.
 22. The device as recited in claim 21 wherein the first markingor the second markings are disposed on a threadless shaft part of thepin.